This section is from the book "Machine Shop Work", by Frederick W. Turner, Oscar E. Perrigo, Howard P. Fairfield. Also available from Amazon: Machine shop work.
Diameter of Mill (in.) | Revolutions per Minute | Speed of Cutter per Minute (ft.) | Depth of Cut (in.) | Width of Cut (in.) | Feed per Minute | |
In Scale of Cast Iron (in.) | Under Scale of Cast Iron (in.) | |||||
3 | 42 | 34 | 1/16 | 1 | 6 5/8 | 8 7/8 |
42 | 34 | 1/2 | 1 | 4 1/8 | 6 1/2 | |
42 | 34 | 1/16 | 2 | 6 5/8 | 8 7/8 | |
42 | 34 | 1/2 | 2 | 2 1/2 | 4 1/8 | |
42 | 34 | 1/16 | 3 | 6 5/8 | 8 7/8 | |
42 | 34 | 7/16 | 3 | 1 3/8 | 2 3/16 | |
3 1/2 | 42 | 40 | 5/32 | 8 | 4 1/8 | 6 1/4 |
42 | 40 | 1/8 | 3 1/2 | 2 1/2 | 31 | |
4 1/2 | 42 | 50 | 1 | 2 | 4 1/8 | 6 1/2 |
42 | 50 | 1 | 4 | 3 1/2 | 4 1/8 | |
42 | 50 | 1 | 6 | 2 | 2 1/4 | |
42 | 50 | 1/8 | 6 | 4 1/8 | 6 1/2 | |
42 | 50 | 11/32 | 12 | 1 3/8 | 2 | |
Diameter of Mill (in.) | Revolutions per Minute | Speed of Cutter per Minute (ft.) | Depth of Cut (in.) | Width of Cut (in.) | Feed per Minute | |
In Scale of S.M.S. (in.) | Under Scale of S.M.S. (in.) | |||||
3 | 38 | 30 | l/16 | 1 | 6 | 8 |
38 | 30 | 1/2 | 1 | 1 1/8 | 1 7/8 | |
38 | 30 | 1/16 | 2 | 2 3/8 | 3 1/2 | |
38 | 30 | 1/2 | 2 | 3/4 | 1 1/8 | |
38 | 30 | 1/16 | 3 | 1 1/8 | 1 7/8 | |
38 | 30 | 3/8 | 3 | 3/4 | 1 1/8 | |
3 1/2 | 38 | 35 | 1/16 | 8 | 1 7/8 | 3 |
38 | 35 | 1/8 | 8 | 3/4 | 1 1/8 | |
4 1/2 | 25 | 30 | 1/16 | 3 | 4 | 5 |
25 | 30 | 1/16 | 5 | 2 1/2 | 4 1/2 | |
25 | 30 | 3/8 | 5 | 1/2 | ||
25 | 30 | 1/16 | 10 | 1 3/4 | 2 1/2 | |
25 | 30 | 3/16 | 10 | 1/2 | 7/8 | |
and feeds are those used when the milling cutters are made from a good grade of carbon tool steel. If the cutters used are made from the newer high-speed steels, these figures can be decidedly increased.
 
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